Heater



FIG. 1 is a front, right-side, and top view of a heater showing the new design.

FIG. 2 is a top plan view of the heater.

FIG. 3 is a front elevation view of the heater.

FIG. 4 is a right-side elevation view of the heater.

FIG. 5 is a rear elevation view of the heater.

FIG. 6 is a left-side elevation view of the heater; and,

FIG. 7 is a bottom plan view of the heater. 

CLAIM The ornamental design for a heater, as shown. 